# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
DROP       tcp  --  anywhere             anywhere           tcp dpt:2000 
DROP       tcp  --  anywhere             anywhere           tcp spt:2000 

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
TCPMSS     tcp  --  anywhere             anywhere           tcp flags:SYN,RST/SYN TCPMSS clamp to PMTU 
fwd_chain  all  --  anywhere             anywhere           
DROP       udp  --  anywhere             anywhere           udp dpt:2429 
DROP       udp  --  anywhere             anywhere           udp dpt:2427 
DROP       udp  --  anywhere             anywhere           udp dpt:2727 
DROP       udp  --  anywhere             anywhere           udp dpt:2432 
DROP       udp  --  anywhere             anywhere           udp dpt:6727 
DROP       udp  --  anywhere             anywhere           udp dpt:0 
DROP       udp  --  anywhere             anywhere           udp dpt:1719 
ACCEPT     all  --  anywhere             anywhere           

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain INETIN (0 references)
target     prot opt source               destination         

Chain INETOUT (0 references)
target     prot opt source               destination         

Chain LDROP (0 references)
target     prot opt source               destination         

Chain TCPACCEPT (0 references)
target     prot opt source               destination         

Chain UDPACCEPT (0 references)
target     prot opt source               destination         

Chain fwd_chain (1 references)
target     prot opt source               destination         

Chain trusted_dest (0 references)
target     prot opt source               destination         

Chain trusted_port (0 references)
target     prot opt source               destination         

Chain trusted_src (0 references)
target     prot opt source               destination